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US Patent: 421,773
Screw Cutting Die
Patentee: Thomas L. Smith (exact or similar names) - Milwaukee, WI USPTO Classifications: 408/163 Tool Categories: metalworking tools : taps and dies Assignees: Pratt & Whitney Co. - Hartford, CT Manufacturer: Not known to have been produced Witnesses: L. C. Heermann Henry L. Rickard Joseph P. Schubert Louis G. Leidiger	Patent Dates: Applied: Feb. 23, 1889 Granted: Feb. 18, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Pratt, Whitney & Co.
Description: Original Application filed on 30 Aug 1877. F. H. Richards - patent attorney

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